var momObj = function () {
    this.x;
    this.y;
    this.angle;
    // this.bigEye = new Image();
    // this.bigBody = new Image();
    // this.bigTail = new Image();
    this.momTailTimer = 0;
    this.momTailCount = 0;
    this.momEyeTimer = 0;
    this.momEyeCount = 0;
    this.momEyeInterval = 1000;
    this.momBodyCount=0;

}
momObj.prototype.init = function () {
    this.x = canWidth * 0.5;
    this.y = canHeight * 0.5;
    this.angle = 0;
    // this.bigEye.src = './src/bigEye0.png';
    // this.bigBody.src = './src/bigSwim0.png'
    // this.bigTail.src = './src/bigTail0.png'
}
momObj.prototype.draw = function () {
    //lerp x,y 使得一个值趋向一个目标值
    this.x = lerpDistance(mx, this.x, 0.98);
    this.y = lerpDistance(my, this.y, 0.99);
    //delta angle
    var deltaY = my - this.y;
    var deltaX = mx - this.x;
    var beta = Math.atan2(deltaY, deltaX) + Math.PI;
    //lerp angle
    this.angle = lerpAngle(beta, this.angle, 0.6);
    //tail
    this.momTailTimer += deltaTime;
    if (this.momTailTimer > 50) {
        this.momTailCount = (this.momTailCount + 1) % 8;
        this.momTailTimer %= 50;
    }
    this.momEyeTimer += deltaTime;
    if (this.momEyeTimer > this.momEyeInterval) {
        this.momEyeCount = (this.momEyeCount + 1) % 2;
        this.momEyeTimer %= this.momEyeInterval;
        if (this.momEyeCount == 0) {
            this.momEyeInterval = Math.random() * 1500 + 2000;
        } else {
            this.momEyeInterval = 200;
        }
    }
    ctx1.save();
    ctx1.translate(this.x, this.y)
    ctx1.rotate(this.angle);
    var momTailCount = this.momTailCount;
    var momEyeCount = this.momEyeCount;
    var momBodyCount=this.momBodyCount;
    if(data.double==1){
        ctx1.drawImage(momBodyOra[momBodyCount], -momBodyOra[momBodyCount].width * 0.5, -momBodyOra[momBodyCount].height * 0.5); 
    }else{
        ctx1.drawImage(momBodyBlue[momBodyCount], -momBodyBlue[momBodyCount].width * 0.5, -momBodyBlue[momBodyCount].height * 0.5);
    }
    ctx1.drawImage(momTail[momTailCount], -momTail[momTailCount].width * 0.5 + 30, -momTail[momTailCount].height * 0.5);
   
    ctx1.drawImage(momEye[momEyeCount], -momEye[momEyeCount].width * 0.5, -momEye[momEyeCount].height * 0.5);
    ctx1.restore();
}